EMPLOYEE BENEFIT PLANS Narrative (Details)	1 Months Ended		12 Months Ended
	Apr. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	May 31, 2022 Tranche shares	May 31, 2013 shares	May 31, 2021 shares	May 31, 2020 shares	May 31, 2019 shares
Stock-based Payment Award [Line Items]
Options outstanding			97,000,000		107,000,000	176,000,000	222,000,000
Options outstanding vested			65,000,000
Restricted stock-based awards outstanding			128,000,000		110,000,000	101,000,000	99,000,000
Stock options outstanding			20,000,000
Performance-based stock options [Member]
Stock-based Payment Award [Line Items]
Number of vesting tranches granted that potentially may vest | Tranche			7
Number of tranches vests on attainment of market-based metric | Tranche			1
Number of vesting tranches require attainment of both a performance and a market condition | Tranche			6
Extended expiration period			3 years
Performance-based stock options [Member] | Minimum [Member]
Stock-based Payment Award [Line Items]
Award service period for market-based metric			3 years
Performance-based stock options [Member] | Maximum [Member]
Stock-based Payment Award [Line Items]
Award service period for market-based metric			4 years
2020 Plan [Member]
Stock-based Payment Award [Line Items]
Number of shares authorized			390,000,000
Increase in number of authorized shares of stock that may be issued			300,000,000
Shares of common stock available for future awards			371,000,000
2020 and 2000 Plan [Member]
Stock-based Payment Award [Line Items]
Vesting percentage			25.00%
Vesting period			4 years
Expiration period			10 years
2020 and 2000 Plan [Member] | Service-based stock options [Member]
Stock-based Payment Award [Line Items]
Options outstanding			60,000,000
Options outstanding vested			59,000,000
2020 and 2000 Plan [Member] | Restricted Stock Units [Member]
Stock-based Payment Award [Line Items]
Restricted stock-based awards outstanding			125,000,000
Equivalent number of shares deducted against share pool (in actual number of shares)			2.5
2020 and 2000 Plan [Member] | Performance-based stock options [Member]
Stock-based Payment Award [Line Items]
Options outstanding vested			6,000,000
Stock options outstanding			36,000,000
Acquired plans [Member]
Stock-based Payment Award [Line Items]
Options outstanding			485,000
Directors' Plan [Member]
Stock-based Payment Award [Line Items]
Increase in number of authorized shares of stock that may be issued				2,000,000
Vesting period			4 years
Expiration period			10 years
Options outstanding			474,000
Shares of common stock available for future awards			1,000,000
Directors' Plan [Member] | Restricted Stock Units [Member]
Stock-based Payment Award [Line Items]
Restricted stock-based awards outstanding			59,000
Maximum value of annual grants | $	$ 350,000	$ 400,000